Energy (signal processing)

Relationship to energy in physics

Energy in this context is not, strictly speaking, the same as the conventional notion of energy in physics and the other sciences. The two concepts are, however, closely related, and it is possible to convert from one to the other:

For example, if x(t) represents the potential (in volts) of an electrical signal propagating across a transmission line, then Z would represent the characteristic impedance (in ohms) of the transmission line. The units of measure for the signal energy would appear as volt2·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing by Z, however, the dimensions of E would become volt2·seconds per ohm, which is equivalent to joules, the SI unit for energy as defined in the physical sciences.

Spectral energy density

Seven Year Itch (Collective Soul album)

On September 18, 2001, Collective Soul released their greatest hits compilation Seven Year Itch: Greatest Hits, 1994-2001 (stylized as 7even Year Itch). The compilation includes songs recorded from 1994 to 2001 and included two new tracks; "Next Homecoming" and "Energy". Seven Year Itch received decent reviews and was relatively successful It sold 225,000 copies in the first year after its release and reached number fifty on the Billboard 200; in Canada, it reached number nine on its albums chart and went platinum. All the songs in Seven Year Itch had charted in the US on the Billboard Hot 100, Mainstream Rock Tracks, or the Modern Rock Tracks chart, except for "Energy", which debuted in this compilation.

The compilation has sold over 500,000 copies. It saw a resurgence in sales after Collective Soul began putting out albums on their own independent label, El Music Group, beginning in 2004.

Seven Year Itch was the last album Collective Soul released through Atlantic Records and their last album to feature guitarist Ross Childress, who had been with the band since its 1993/1994 debut.

Critical reception

"Energy" received acclaim from music critics with many calling it the best song of the album. Ryan Dombal of Pitchfork gave the song a positive review and named it "Best New Track", stating "The song isn't aimed to any rappers or pop stars, not Kendrick Lamar, Big Sean or Tyga, but the song lines are dangerous."

Music video

Release

The video of "Energy" was released on Apple Music and users with iTunes and registered Apple Music account can watch this video.

Reverse-Flash

Character biography

Edward Clariss

Edward Clariss aka the Rival first appeared in Flash Comics #104 (February 1949). Dr. Edward Clariss, a professor at the university attended by the Golden Age Flash, Jay Garrick, has recreated the formula that gave Garrick his speed, which he calls "Velocity 9." He had heard Joan one night talking about how the Flash gave his speed to another student, which helped him get the last formula. Bitter at the scientific community's rejection of his claims, Clariss becomes a criminal. He wore a darker version of Flash's outfit and gave it to several other criminals. The Rival's version of the formula proves to be temporary, and he is defeated and jailed.

In JSA #16 (November 2000), a flashback shows a battle between the Rival and the Flash that took place several months after Clariss' first appearance. Through unexplained methods, Clariss has regained the power of super speed. During the fight, Clariss reaches light speed and vanishes into the Speed Force. Following the reformation of the Justice Society of America 50 years later, Johnny Sorrow retrieves Clariss from the Speed Force and invites him to join the new Injustice Society. The Rival, driven insane by his time in the Speed Force, races across the country on a super-speed killing spree. The Flash realizes that the Rival's path across the country spells out Clariss' name, and that the final murder will be Jay's wife Joan. The Flash absorbs the Rival's speed before he can kill Joan.

Energy (signal processing)

Relationship to energy in physics

Energy in this context is not, strictly speaking, the same as the conventional notion of energy in physics and the other sciences. The two concepts are, however, closely related, and it is possible to convert from one to the other:

For example, if x(t) represents the potential (in volts) of an electrical signal propagating across a transmission line, then Z would represent the characteristic impedance (in ohms) of the transmission line. The units of measure for the signal energy would appear as volt2·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing by Z, however, the dimensions of E would become volt2·seconds per ohm, which is equivalent to joules, the SI unit for energy as defined in the physical sciences.

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